Magazine Limit Nearly Killed a Hero

A former Marine engaged an active shooter on a Cambridge, Massachusetts highway and ran dry at eight rounds — while state law capped his magazine at a fraction of standard capacity.

Catch up quick:

• A gunman opened fire on a Cambridge highway; a former Marine intervened, directing bystanders to cover and forcing the shooter to deal with armed resistance
• The Marine ran out of ammunition before the threat was neutralized
• A responding state trooper arrived and ended the incident — but the margin was razor-thin

The armed citizen didn't fail. Massachusetts law did. Standard Glock magazines hold 15–17 rounds. The state's ban on magazines over 10 rounds — with a narrow pre-1994 exemption that almost nobody qualifies for — meant this man walked into a gunfight carrying roughly half the ammunition he'd have had anywhere else in the country.

Reality check: Magazine capacity restrictions are sold as a way to limit mass-casualty events. The math doesn't support it. The average number of shots per criminal fatality runs around four — meaning even a revolver clears that bar. What capacity limits actually do is constrain the law-abiding carrier who can't predict how many rounds a bad day will require. The shooter in Cambridge came prepared with multiple magazines. His victim-turned-defender did not have that option under law.

Between the lines: The responding state trooper almost certainly carried a SIG Sauer P320 — the current Massachusetts State Police service pistol — loaded with 17-round magazines. The man who bought time for that trooper to arrive was limited by law to a fraction of that capacity. One class of armed citizen gets full magazines. The other gets whatever the legislature decided was enough.

"Eight rounds is obviously not enough for an extended gunfight against a criminal who came prepared with multiple magazines." — American Rifleman

The big picture: Bad actors choose the time, place, and nature of an attack. Armed citizens respond with whatever they carried out the door that morning. Restricting magazine capacity doesn't touch that asymmetry for criminals — it sharpens it against the people trying to stop them. Massachusetts's violent crime rate, for the record, is only marginally better than Georgia's, which has no magazine restrictions and a fraction of the median household income.

The bottom line: This Marine is alive because a trooper arrived in time. That's luck, not policy. The law that nearly got him killed is still on the books.